here is what I am doing.
First get the overflow (which you can likely get a good one secondhand here)
waterline tubing that can transport the water from the overflow to the sump tank.
the sump tank design is totally up to you, but I do not have room for a traditional sump, so I am using a 5g bucket. A large PVC (4in) to hold the bio balls (or other compatible medium) the water from the tank goes onto the bioballs, and if you have more space than the 4 in like me, you'll need a drip plate to ensure even flow. a small hole or two in the bottom of this pipe so water can come out to the rest of the bucket; than the pump that is in the bucket pushes the water into the tank via another tube.
...for your 44g, you'll need to push around 300g/h.
learn about the max head of a pump, because it may say 300 g/h but if you have the pump 6ft below the tank, it will loose pressure, and you may not get any flow at all.
Ask any questions for more detail of course, and anyone is open to tell me I'm wrong...